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Editor to share with you how to achieve mvvmlight and icommand classes, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to understand it!

First build a class that implements the ICommand interface

Public class RelayCommand: ICommand {private Action _ execute; private Predicate _ canExecute; public RelayCommand (Action execute, Predicate canExecute) {this._execute = execute; this._canExecute = canExecute;} public event EventHandler CanExecuteChanged {add {CommandManager.RequerySuggested + = value } remove {CommandManager.RequerySuggested-= value;}} public bool CanExecute (object parameter) {return _ canExecute (parameter);} public void Execute (object parameter) {_ execute (parameter);}}

Add in viewmodel

Void UpdateExecute () {Console.WriteLine ("ICommandExecute");} bool CanUpdateExecute () {return true;} private ICommand _ doSomething Public ICommand DoSomething {get {if (_ doSomething = = null) {_ doSomething = new RelayCommand (p = > this.UpdateExecute (), p = > this.CanUpdateExecute ());} return _ doSomething;}}

Bind with Command in xaml

Suppose we are using RadioButton

Note:

Binding DataContext.DoSomething

DataContext is used here.

Then set up the RelativeSource.

Otherwise, if you cannot find this method, you will output an error message.

These are all the contents of the article "how to implement mvvmlight and icommand classes". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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